Question

The collision between air molecules and diffracted X-ray are the___________

(a) Sources of background scattering

(b) Sources of front reflection

(c) Sources of diffraction

(d) Sources of background irradiation

I have been asked this question by my college professor while I was bunking the class.

My question is taken from Sources of Background Radiation Fluorescence topic in section X-Ray Diffraction of Solid State Chemistry

Answer 1

Right choice is (a) Sources of background scattering

The explanation is: The quality of an X-ray powder diffraction pattern is governed to a considerable extent by the level of background radiation which is present. Collisions between air molecules and diffracted X-ray beams are the sources of background scattering. For high quality Guinier focusing films it is worth while to evacuate the box containing the sample and film.